Noun

1. The right to enter
2. The right to obtain or make use of or take advantage of something (as services or membership)
3. A way of entering or leaving
4. A code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)
5. (computer science) the operation of reading or writing stored information
6. The act of approaching or entering

Verb

1. Obtain or retrieve from a storage device; as of information on a computer
2. Reach or gain access to